package com.itheima.reggie.filter;


import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;


@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {

    //路径匹配器，支持通配符
        public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

        @Override
        public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {

            HttpServletRequest request = (HttpServletRequest) servletRequest;
            HttpServletResponse response = (HttpServletResponse) servletResponse;

            //0. 禁止远程访问
            String remoteAddr = request.getRemoteAddr();

            System.out.println(remoteAddr);

/*           if (!remoteAddr.equals("0:0:0:0:0:0:0:1")) {

*//*                String uri = request.getRequestURI();
                if (uri.equals("/backend/a.html")){

                    filterChain.doFilter(request,response);
                    return;
                }*//*

               response.getWriter().println("<h1 style = 'color : red ; font-size = 200px;'><center>别访问了,咒你秃头!!</center></h1>");

               //response.getWriter().println("<a>window.location.href='/backend/a.html'</a>");
               //response.getWriter().println("<a href=\"/www.itcast.cn\" target=\"_self\">点我有惊喜</a>");

               return;

            }*/

            //1、获取本次请求的URI
            String requestURI = request.getRequestURI();



            log.info("拦截到请求：{}",requestURI);

            //定义不需要处理的请求路径
            String[] urls = new String[]{
                    "/employee/login",
                    "/employee/logout",
                    "/backend/**",
                    "/front/**",
                    "/user/sendMsg",
                    "/user/login"

            };

            //2、判断本次请求是否需要处理
            // 比较两个路径是否相等 requestURI 是否等于 urls
            boolean check = check(urls, requestURI);

            //3、如果不需要处理，则直接放行
            if (check){
                log.info("本次请求{}不需要处理",requestURI);
                filterChain.doFilter(request,response);
                return;
            }

            //4、判断登录状态，如果已登录，则直接放行
            // 判断session是否为空
            if (request.getSession().getAttribute("employee") != null){

                log.info("用户已登入，用户id为：{}",request.getSession().getAttribute("employee"));

                BaseContext.setCurrentId((Long) request.getSession().getAttribute("employee"));

                filterChain.doFilter(request,response);
                return;
            }


            //4-2、判断登录状态，如果已登录，则直接放行
            if(request.getSession().getAttribute("user") != null){
                log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("user"));

                Long userId = (Long) request.getSession().getAttribute("user");
                BaseContext.setCurrentId(userId);

                filterChain.doFilter(request,response);
                return;
            }

            log.info("用户未登录");
            //5、如果未登录则返回未登录结果，通过输出流方式向客户端页面响应数据
            // 吧R对象转换成json对象响应给客户端
            //response.getWriter().write(JSON.toJSONString("NOTLOGIN"));
            response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));


        }


        /**
         * 路径匹配，检查本次请求是否需要放行
*/

    public boolean check(String[] urls,String requestURI){
            // 遍历urls
            for (String url : urls) {
                // 比较urls是否等于requestURI
                // 如果是 则返回true
                // new 一个 AntPathMatcher 类
                // 改类里面有一个比较的方法
                boolean match = PATH_MATCHER.match(url, requestURI);
                if (match){
                    return true;
                }
            }
            return false;
        }
    }

